Build Your Own Bluetooth Speaker in 30 Minutes
Build your own high-end Bluetooth speaker in 30 minutes using an ESP32 and a few simple hobbyist components.
When your Bluetooth speaker blasts out its last note and fades into silence, you don’t need to order a new one and wait days for it to arrive. Instead, you can build your own with just a few basic components that most electronics hobbyists already have in their spare parts bin. Simply connect a handful of wires, flash the firmware, and you’ll be listening to your favorite tunes again in a matter of minutes.
YouTuber Volos Projects recently demonstrated an easy way to make a DIY Bluetooth speaker. First, you’ll need a LILYGO T-Display board, which uses an older ESP32 chip. This detail is more important than it might seem — unlike newer variants such as the ESP32-S3, this chip supports Bluetooth Classic, which is required for handling high-quality audio streaming via the A2DP protocol. Paired with the microcontroller is a MAX98357A module, a compact I2S digital-to-analog converter with a built-in 3-watt Class D amplifier, capable of driving a small speaker directly.
The ESP32 communicates with the audio module over an I2S interface, sending a digital audio stream that the DAC converts and amplifies for playback. A simple speaker connects directly to the module’s output, while a jumper wire tweak ties the gain pin to ground, boosting the amplifier’s output for increased volume.
On the software side, the build relies on a specialized Bluetooth audio library, which simplifies the otherwise complex task of implementing A2DP streaming. One important detail is the need to use an older ESP32 board definition — version 2.0.7 — within the Arduino IDE, as newer releases can break compatibility with Bluetooth Classic features.
This build is more than just a basic audio receiver, thanks to its integrated display. Using the TFT_eSPI library, the small onboard screen shows connection status, playback activity, and the name of the currently playing track. This adds a polished, consumer-grade feel to an otherwise minimalist DIY build.
If you’ve got 30 minutes or so and a few spare parts, you can build your own Bluetooth speaker. Check out the video below for all the details you need.
R&D, creativity, and building the next big thing you never knew you wanted are my specialties.